Tesla CEO Elon Musk was on hand recently at a Q&A session in Norway and he offered up some information on current and future Tesla vehicles.

One of the vehicles that Musk talked about was the upcoming Model X. Musk explained that the Model X will have the same wheelbase as the Model S, and that its length will be within 2” of the sedan. The Model X, however, will be quite a bit taller given that it’s a crossover (and to provide additional headroom for the third-row passengers).

Since the Model X will be heavier than the Model S, Tesla figures that the X will have about 10% higher energy consumption.

Tesla Model X Concept

Musk also stated that the production Model X would definitely retain the "Falcon Doors" for rear seat occupants. The rear doors are hinged in the roof instead B-pillar, which should allow for easier entry/exit in tight parking spaces. All-wheel-drive will be standard on the Model X with a separate electric motor driving the front wheels.

Speaking of AWD, the Model S will receive AWD as an option once the Model X goes into production. Tesla promises that AWD versions of the car will have the same driving range as the current RWD version; something that rarely (if ever) occurs with gasoline- or diesel-powered vehicles.

Tesla Model S

“Typical experience of AWD is that the efficiency will be worse. We've worked really hard to not have that same effect,” explained Tesla CTO JB Straubel. “We found some clever ways with dual motor AWD, not just mechanical linkage. To make that an efficiency neutral option breakthrough. Flat efficiency tradeoff.”

Software updates coming to the Model S will add a hill-hold function and allow manual selecting of ride height over a wider range of speeds. Feature updates coming down the road will include guidance lines on the backup camera, adaptive cruise control, and Musk also promised that Model S cars coming off the line in the near future would have more comfortable front seats. The new seat can be retrofitted into existing cars.